Van Wolfswinkel arrived for £8.5million last summer but has endured a disappointing campaign, managing just one goal in 25 appearances this season.
"Obviously Ricky needs a goal," Adams said.
"He's come with a hefty price tag and he works his socks off - he gives you everything you want in a centre-forward but, of course, they're paid to score goals and he knows that.
"If he gets one I think he'll go on a run, but it just doesn't seem to come for him at the moment."
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